Q: I replace my ecm cranks once but won't start

asked by on

I replaced my ECM and now it cranks over once but won't start. Then if I was to try and start it for the 2nd time, it won't do anything. Not sure what it could be
My car has an automatic transmission.

A: Hi, thanks for writing in. There are a numb...

Hi, thanks for writing in. There are a number of systems that your ECM controls. Be sure you are getting power to all of your critical components like fuel pump, injectors, coil packs, etc. Check to see if when cranking the car gets fuel. Do this by cranking it and then pulling a spark plug out to see if it is wet with fuel. Next check things like crank and cam sensors as these can cause the car to not produce a spark when not functioning properly as they contribute to proper timing.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: I can't start my car after running out of gas I took it to dealership and they said it wouldn't hook up to the diagnostic machine

Hello there, you have several issues going on with your 2007 Nissan Xterra. When a vehicle runs out of gas like this, it can cause the debris built up over time in the gas tank to clog the fuel pump...

Q: Bluetooth works engine off

Hello. EMI (electromagnetic interference) is electromagnetic energy that is passed through electronic devices. EMI is disruptive and can affect bluetooth devices and/or your GMC Safari's electronic system if not properly shielded. This is not a common problem, but it is...

Q: Car feels like it is going to cut off

Hi, thanks for writing in. I'd be happy to offer my insight. You engine may have carbon build up on the valves and clogged injectors. I recommend having the combustion chambers and injectors cleaned. Once this is done then I...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...